Typewriter



fr Evil n au @ser gera Dit En n vf FRANCTS J'. IVICLOGHLIN, OF BROOKLYN, NEWT YGRK.

TYPEWRITER.

Application filed August 17, 1918.

To all whom t may concern.'

Be it known that l, Francis J. McLoUGH- Lin, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Tmprovements in Typewriters; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to an improved form of type-bar action so constructed that the type bars lie in a single horizontal plane and, during action, are moved through an angle of about 180 degrecs to strike a platen located in virtually the same plane. The advantage of this arrangement is found in an increased compactness, and in the production of a flat machine of a shape making it easy to be packed. This arrangement also leaves room beneath the type bars which can be utilized in various ways.

The invention is illustrated in two of various possible modif-,cations in the accompanying drawings, wherein Figure 1 is a side elevation of a single type-bar action, Figure 2 is a perspective view of one of the operating links, and Figure 3 is a view similar to Figure 1 showing a modified form of action.

The type bar 10, carrying the usual types 11 at its striking end, is pivoted in any appropriate manner at 12. lts base is shaped as shown with a preferably straight terminal edge against which the link 13 normally rests along its whole length. This link as preferably constructed is bifurcated at both ends, and one of these ends embraces a boss 14 on the base of the type bar, to which the link is pivoted at that point.

The opposite end of the link 18 is similarly pivoted to one end of an operating tension member, which may or may not be of rigid construction, and is shown in Figure 1 in the form of a connecting rod 15. The preferred means for imparting operative tension to the member' 15 consists of a key 16 pivotally mounted upon parallel bars 17 and 18, which in turn are mounted upon a standard 19. The bar 18 has the form of a bell crank lever, one arm, 20, of

Specification of Letters Patent.

lifatented 8, 121.22.

serial no. 250,367.

which is pivotally connected at its eX- tremity with the tension member 15.

Upon depressing the key 16, so as linally to bring the same with the type bar into the position shown in dotted lines, the first action is to cause the link 13 to bear against the lower corner of the base of the type bar, so as to tilt the type bar rapidly around its pivotal support 12. "When the bar has been tilted so far as to bring its terminal edge in line with the tension member 15, further movement is produced by the pull of the link upon the pivot at 14, and thereafter the lever arm at the type bar base shortens rapidly, so as to increase the speed of movement of the bar until it comes into contact with the platen 21.

The preferred means for returning the type bar to its normal position comprises a light link 22, pivotcd to the side of the type bar forward of the pivot 12; and a tension spring 23 attached at one end to the free extremity of said link and at its opposite end fixed to the framework of the machine, as at 24. During the initial rearward movement of the type bar the combined link and spring constitutes a mere tension member acting through a very small leverage; but after the stroke is delivered (as shown in dotted lines in Figure 1) the taut spring exerts its force with considerable leverage upon the link 22 which operates as a lever whose fulcrum is the pivot 12. This insures prompt and snappy return action of the type bar.

While the direct pull action above dcscribed is preferred, .my invention includes other forms of operating means for the type bars.

For instance, in Figure 3 is shown a construction wherein two type bar-operating links 25 and 26 are used. The link 25 lies normally against the edge of the type bar base and is pivotally attached to the link 26, the forward end of which is pivoted to the boss 27 forward of the supporting pivot 12. The lower end of the link 25 is pivotally attached to the bell crank lever 28 which is operated from the lever 18 through the bar or other tension member 29. The operation of this modification is indicated by the dotted lines in Figure 3.

Various changes may be made in the conlstruction of my device Without departnear 'its base, Said link being adapted to ing from the scope of my invention and I act by direct tension at the commencement 10 do not limit myself to the details herein of 2L Stroke and, near the end of the stroke, shown and described, f as a lever Whose ulcrnm is the supporting What I claim ispivot of the type bar., In a typewriter a pivotally mounted type In testimony' whereof I a'HiX my signabarj a returning spring therefor and a link ture.

connecting said spring with the type bar, i FRANCIS J. MOLOUGHLIN. 

